This PR adds a new find API for retrieving a subset of the user actions
for a case.
Issue: https://github.com/elastic/kibana/issues/134344
```
GET /api/cases/<case_id>/user_actions/_find
Query Paramaters
{
types?: Array of "assignees" | "comment" | "connector" | "description" | "pushed" | "tags" | "title" | "status" | "settings" | "severity" | "create_case" | "delete_case" | "action" | "alert" | "user" | "attachment"
sortOrder?: "asc" | "desc"
page?: number as a string
perPage?: number as a string
}
```
<details><summary>Example request and response</summary>
Request
```
curl --location --request GET 'http://localhost:5601/api/cases/8df5fe00-96b1-11ed-9341-471c9630b5ec/user_actions/_find?types=create_case&sortOrder=asc' \
--header 'kbn-xsrf: hello' \
--header 'Authorization: Basic ZWxhc3RpYzpjaGFuZ2VtZQ==' \
--data-raw ''
```
Response
```
{
"userActions": [
{
"created_at": "2023-01-17T21:54:45.527Z",
"created_by": {
"username": "elastic",
"full_name": null,
"email": null,
"profile_uid": "u_mGBROF_q5bmFCATbLXAcCwKa0k8JvONAwSruelyKA5E_0"
},
"owner": "cases",
"action": "create",
"payload": {
"title": "Awesome case",
"tags": [],
"severity": "low",
"description": "super",
"assignees": [],
"connector": {
"name": "none",
"type": ".none",
"fields": null,
"id": "none"
},
"settings": {
"syncAlerts": false
},
"owner": "cases",
"status": "open"
},
"type": "create_case",
"id": "8e121180-96b1-11ed-9341-471c9630b5ec",
"case_id": "8df5fe00-96b1-11ed-9341-471c9630b5ec",
"comment_id": null
}
],
"page": 1,
"perPage": 20,
"total": 1
}
```
</details>
## Notable Changes
- Created the new `_find` route
- Created a new `UserActionFinder` class and moved the find* methods
from the `index.ts` file into there as well as the new find logic
- Extracted the transform logic to its own file since its shared between
multiple files now
- Extracted the user action related integration test functions to the
`user_action.ts` utility file
Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>
Co-authored-by: lcawl <lcawley@elastic.co>
